The small removable handle on the B10 needs to be bigger and more robust for two reasons: It can't hold XL umbrellas securely, and if you try to handhold the flash, the handle is too small. Compare this to the properly built B1X handles (both the built-in and the large knobby handle on the base).
Just give us an extra sturdy option that supports umbrellas better and is more comfortable to hold in one hand. Also, get rid of the tooth engagement positions. Many photographers (interior, real estate, etc.) hold the flash in their hand, and the small handle makes it difficult and uncomfortable. This is why I always use a B1X instead of B10.
Giving us the extra option for a bulky handle will just make it more versatile.
I use the b10 plus professionally as part of my setup on a daily basis. I love the stand adapter compactness, but would suggest
1 - A much stronger joint for professional use, as well as for safety!
2 - A step-less design for precise adjustment.
I think it may be worth sacrifice a little on the compactness in exchange for rigidity.
A weak and unreliable stand just make me hesitate to trust this setup 100%
I use Profoto Air Remotes primarily to control my lights but using sync cables can be very helpful too in various settings. This feature is available on the older B2 and why I still use it often!
If you don't end up going to USB-C connectors, a nice improvement in the B10/+ battery would be to make the hole where the power plug goes in sloped or designed in a way to make it easier to plug in when the environment is dark. I've added a white paint ring around the hole to make it easier to find, but I'm sure you could come up with a better solution.
Shooting outdoors in the sun requires a lot of flashpower. Since the B10's are so compact and light, mounting two together would make for an extra valueble f-stop.
A fully plastic zoom reflector or magnum OCF reflector could be a good idea and less expensive than the current metal ones. Metal ones can get bent on location. No locking ring is needed. Just a slide on design with some integral tabs that provide pressure to the outside of the light housing to keep it secure. Having a plastic one would be good in that it is less expensive = more sales, and if they get damaged it doesn't hurt the pocketbook as much. It likely won't be as reflective as the metal ones, but in many cases that is not an issue.
